EASY
12th CBSE
IMPORTANT
Earn 100
Draw a graph showing variation of photocurrent with the anode potential of a photocell.
Important Questions on Dual Nature of Radiation and Matter
MEDIUM
12th CBSE
IMPORTANT
Draw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.
MEDIUM
12th CBSE
IMPORTANT
If the light of wavelength is incident on each of the metals given below, which ones will show photoelectric emission and why?
| Metal | Work Function(eV) |
| Na | 1.92 eV |
| K | 2.15 eV |
| Ca | 3.20 eV |
| Mo | 4.17 eV |
HARD
12th CBSE
IMPORTANT
Why is wave theory of electromagnetic radiation is not able to explain photo electric effect? How does photon picture resolve this problem?
HARD
12th CBSE
IMPORTANT
Plot a graph showing variation of de Broglie wavelength associated with a charged particle of mass , versus , where is the potential difference through which the particle is accelerated. How does this graph gives us the information regarding the magnitude of the charge of the particle?
MEDIUM
12th CBSE
IMPORTANT
Photons of energies and are successively incident on a metallic surface of work function . The ratio of kinetic energy of most energetic photoelectrons in the two cases will be
MEDIUM
12th CBSE
IMPORTANT
A proton and an electron have equal speeds. Find the ratio of de Broglie wavelengths associated with them.
MEDIUM
12th CBSE
IMPORTANT
The variation of the stopping potential with the frequency of the light incident on two different photosensitive surfaces M1 and M2 is shown in the figure. Identify the surface which has greater value of the work function.
MEDIUM
12th CBSE
IMPORTANT
Write two main observations of photoelectric effect experiment which could only be explained by Einstein's photoelectric equation.
